Since the upgrade to 10.11.4 won't open my app store.

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  then I realized that the problem is in my cuz IPS (Internet Service Provider), it could not find the server
  configure your own server-to-server of google
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  There are several possible reasons for the release of its failure. Please take each of the following steps that you have not already tried it. Some may not apply to your model. Stop when the problem is resolved.

  Back up all data before making any changes.

  1. start by the steps recommended in this support article. Do not skip any step. It is the starting point for further efforts fix.

  2 make sure that you have an installation fully updated to Mac OS X.

  3. If you have installed an application called 'Own memory' or any other third party software that is supposed to 'clean' or 'purge' memory automatically, remove it according to the instructions of the developer and restart. You should do this even if the software is not causing the problem, because it is useless.

  4. other third party which has been reported to interfere with an audio software includes the "Boom" and "Samsung Kies". If necessary, uninstall instructions of the developer (not not by dragging something in the trash.)

  5. If a device AirPlay is selected for the audio release of iTunes (or other applications via third party software such as "Wing"), deselect it.

  6. launch the application 'Setting up Audio and MIDI' by entering the first letters of his name in a Spotlight search and by selecting it in the results (it should be at the top). Select output integrated in the list on the left. If the mute boxes are checked, then.

  7. If a red light is visible in the port of audio when its must play, the internal switch is stuck in the position of the digital display. You may be able to release it by inserting and removing of a mini stereo plug of adequate size. If this is not the case, the machine needs to be repaired. Insert any kind of tool in the port can cause damage that is not covered by the warranty.

  If there is no red light, the switch can always be locked in the position of the helmet. Try to clear the same way.

  8 disconnect all devices wired except the keyboard and mouse, as appropriate. If more than one display is connected, unplug all the extra zeros. Restart and test.

  9. If you have a MacBook Air, turn Bluetooth off and restart.

  10 start in safe mode. Do not open a session; Just restart as usual when the login screen appears. When you do, make sure that the words "Safe Boot" do not appear in the login screen. If they do, the system is still in safe mode and the sound does not work.

  11. reset the NVRAM.

  12. Reset the SMC.

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  14. reinstall OS X after you back up all data.

  15. an appointment of 'Genius' in an Apple store.

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